1,720,963 research outputs found
Study of the active cliffs and the dune field from Bahía Creek, Río Negro, Argentina as base for the elaboration of a geological hazard map
Get PDFEn el presente trabajo se realizó una caracterización física junto al estudio de aspectos socioeconómicos de la región costera de Bahía Creek. Se analizaron así el acantilado activo y el campo de dunas de Bahía Creek así como el desarrollo de la población local. Las características relevadas permitieron evaluar el riesgo de erosión del acantilado activo, calculado como una medida numérica única a través de un índice de riesgo. Estas características fueron estudiadas en tres sectores, resultando el índice de riesgo medio en dos sectores y bajo en el restante. Luego, en base a imágenes satelitales, fotografías aéreas y datos de viento, se calculó la tasa de avance anual para las dunas ubicadas más próximas a la población de Bahía Creek. A partir de la tasa de avance de las dunas, estimada en 5.71 m/año, se proyectó su futura ubicación en los próximos 10, 25, 50 y 100 años. Conociendo los valores del índice de riesgo del acantilado y la probable ubicación de las dunas en el futuro, se elaboró un mapa de peligro geológico para la zona de Bahía Creek, el cual considera sectores de peligro alto, medio y bajo. El sector de alto peligro considera las zonas donde actualmente se ubica el acantilado activo y las dunas activas y donde su retroceso o avance, respectivamente, pueda ocurrir en el corto - mediano plazo, es decir, meses o hasta los próximos 25 años. La zona de peligro medio presenta marcadas irregularidades del terreno, se ubica a continuación de la zona de alto peligro y podría verse afectada dentro de los próximos 50 años por el retroceso del acantilado y el avance de las dunas. En la zona de bajo peligro, se estima que el terreno no sufrirá modificaciones en al menos 100 años, en consecuencia se recomienda como área para realizar futuras edificaciones. La zona del actual asentamiento poblacional se encuentra casi en su totalidad dentro de la zona de alto peligro, por lo tanto se discuten posibles medidas de manejo a implementar en relación con el mismo.In this paper, a physical characterization was carried out together with the study of some socioeconomic aspects of the coastal region of Bahía Creek; so, the active cliff and the dune field of Bahía Creek were analyzed as well as the development of the local population. The recorded characteristics permitted to develop a risk assessment of the active cliff erosion, calculated as a unique numerical measure through a risk index. It was studied in three sectors, resulting medium in two sectors and low in the remaining. In addition, based on satellite images, aerial photographs and wind data, the annual migration rate for the closest dunes to the town of Bahía Creek was calculated. According to the migration rate of the dunes, estimated at 5.71 m/year, its future location was projected in the next 10, 25, 50 and 100 years. Knowing the risk index values of the cliff and the probable location of the dunes in the future, it was possible to draw up a geological hazard map for the Bahía Creek area, which was subdivided into high, medium and low hazard. The high hazard zone considers the areas where the active cliff and active dunes are currently located and where their retreat or advance, respectively, may occur in short - medium term, i.e., months or until the next 25 years. The medium hazard zone presents marked irregular terrain and is located next to the high hazard zone and may be affected within the next 50 years by the retreat of the cliff and the dune migration. On the low hazard zone, it is inferred that it will not be modified in a lapse of at least 100 years, consequently it is advisable to build there in the future. The area of the current population settlement is almost entirely within the high hazard zone. Therefore, likely management measures to be implemented in relation to it are discussed.Fil: Toffani, Mauricio. Universidad Nacional de Río Negro; ArgentinaFil: Caselli, Alberto Tomás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina. Universidad Nacional de Río Negro; ArgentinaFil: Lothari, Lucas Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Negro; Argentin
Onset of foreland basin deposition in the Neuquén Basin (34°-35°S): New data from sedimentary petrology and U–Pb dating of detrital zircons from the Upper Cretaceous non-marine deposits
Get PDFA multi-proxy provenance approach using sedimentology, petrology and detrital zircon U–Pb geochronology provides new constrains for the evolution of the Southern Central Andes. The Upper Cretaceous non-marine deposits of the Neuquén Basin referred as Neuquén Group in the central and southern sector of the basin, have been characterized as the first foreland basin associated with the early uplift of the Andean orogen at ca. 100 Ma. However, in the northern sector of the basin, the stratigraphically equivalent Diamante Formation has not been studied in detail yet. This work focuses in the outcrops of the Diamante Formation located between Laguna del Diamante and Atuel River in southern Mendoza Province, Argentina (34°-35°S). The petrographic analysis of sandstones shows high content of volcanic and calcareous lithic fragments suggesting provenance from the underlying sedimentary units and the coeval volcanic arc associated with the onset of an important stage of deformation on the west. Detrital zircons from the base of the Diamante Formation were supplied sources from Upper Jurassic and Lower Cretaceous that were exposed during Upper Cretaceous times, whereas in the top, a high content of Permo-Triassic detrital zircons indicates exhumation of the surrounding Permo-Triassic crystalline basement. Finally, two maximum depositional ages were obtained, 107.2 ± 1.4 Ma to Vega de los Patos and 91.1 ± 2.2 Ma to Vega Grande, suggesting uninterrupted activity of the volcanic arc during foreland basin deposition. In particular, the age of 107.2 Ma would indicate that the sedimentation of the Upper Cretaceous non-marine deposits occurred in the Albian at these latitudes (34°-35°S), which suggests that the onset of the foreland basin sedimentation is diachronic at different positions in the Neuquén Basin.Fil: Gómez, Ricardo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; ArgentinaFil: Lothari, Lucas Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; ArgentinaFil: Tunik, Maisa Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; ArgentinaFil: Casadio, Silvio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentin
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
El volcanismo mioceno superior en el sector oriental de la Cordillera Frontal (30°20´s): geocronología u-pb y análisis de facies del Grupo Olivares
No full textEl Grupo Olivares (Bastías 1991) está conformado por secuencias volcano-sedimentarias queunidad está ubicada sobre el segmento de subducción subhorizontal Pampeano-Chileno (27º33º S), caracterizado en la actualidad por la ausencia de volcanismo activo. A estas latitudes,el volcanismo se desarrolló extendidamente en la Cordillera Frontal durante el Oligocenotardío - Mioceno temprano, mientras que para el Mioceno Medio migró hacia el este,expandiéndose hasta 700 800 km de la fosa actual. Los volúmenes de magma expulsadosfueron reduciéndose significativamente desde entonces, hasta que el magmatismo cesó casipor completo en el Mioceno tardío (Litvak et al. 2019). En este trabajo se presentan los resultados preliminares de la geocronología y análisis de facies realizados en la Cordillera de Olivares, donde el Grupo Olivares aflora ampliamente, apoyándose en discordancia sobre rocas metasedimentarias del Paleozoico Superior (Formación Agua Negra) y rocas volcánicas del Permo-Triásico (Grupo Choiyoi). Para el estudio de esta unidad, se relevaron secciones estratigráficas en las nacientes del arroyo de se tomaron además muestras para análisis de U-Pb en circones.Fil: Bertoa del Llano, Macarena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Mescua, Jose Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Litvak, Vanesa Dafne. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Lothari, Lucas Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Giambiagi, Laura Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Mackaman Lofland, Chelsea. University of Tennessee; Estados UnidosFil: Vanderleest, Rebecca. State University of Colorado at Boulder; Estados UnidosFil: Pingel, Heiko. Universitat Potsdam; AlemaniaFil: Mulch, Andreas. German Research Centre for Geosciences; AlemaniaFil: Cottle, John. University of California; Estados UnidosXXII Congreso Geológico ArgentinoSan LuisArgentinaAsociación Geológica Argentin
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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